Concentration of GPI-anchored proteins upon ER exit in yeast - PubMed (original) (raw)

. 2009 Feb;10(2):186-200.

doi: 10.1111/j.1600-0854.2008.00857.x. Epub 2008 Nov 20.

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Concentration of GPI-anchored proteins upon ER exit in yeast

Guillaume A Castillon et al. Traffic. 2009 Feb.

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Abstract

Previous biochemical work has revealed two parallel routes of exit from the endoplasmic reticulum (ER) in the yeast Saccharomyces cerevisiae, one seemingly specific for glycosyl-phosphatidylinositol (GPI)-anchored proteins. Using the coat protein II (COPII) mutant sec31-1, we visualized ER exit sites (ERES) and identified three distinct ERES populations in vivo. One contains glycosylated pro-alpha-factor, the second contains the GPI-anchored proteins Cwp2p, Ccw14p and Tos6p and the third is enriched with the hexose transporter, Hxt1p. Concentration of GPI-anchored proteins prior to budding requires anchor remodeling, and Hxt1p incorporation into ERES requires the COPII components Sec12p and Sec16p. Additionally, we have found that GPI-anchored protein ER exit is controlled by the p24 family member Emp24p, whereas ER export of most transmembrane proteins requires the Cornichon homologue Erv14p.

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